Personally, I would never trust any locking knife for "stabbing" unless I had to. A fixed blade is always the best choice for the hardest of tasks.
For daily carry, I either carry a Kershaw KO Random Task, or the BM 735 (Ares), which has their "Axis lock."
I have had good luck with my liner locks, but I do not use them for any purposes that would cause the lock to fail. I view the liner lock as a means of keeping the blade in position, rather than a safety, similar to the steel spine on a regular pocket knife.
I believe that the BM's Axis Lock is probably one of the best locks on the market today. It is easy to operate one-handed, and there is little possibility of the lock disengaging during use.
Lockbacks, of course, have proven themselves over time. You can't go wrong by buying a high-quality lockback.
In short, it depends what you want out of your knife, and what you plan to use it for.
Cheers...